Reciprocal irreversibility compensation of LiNi0.2Co0.2Al0.1Mn0.45O2 cathode and silicon oxide anode in new Li-ion battery. (1st June 2023)

• Record Type: Journal Article
• Authors: Minnetti, Luca; Marangon, Vittorio; Andreotti, Paolo; Staffolani, Antunes; Nobili, Francesco; Hassoun, Jusef
• Is Part Of: Electrochimica acta. Volume 452(2023)
• Publication Date: 2023-06-01
• Subjects: LiNi0.2Co0.2Al0.1Mn0.45O2 cathode -- Silicon oxide anode -- Synthesis -- Li-ion battery -- Cell balance; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2023.142263
• Languages: English
• ISSNs: 0013-4686

Abstract

Highlights: A layered LiNi0.2 Co0.2 Al0.1 Mn0.45 O2 cathode is synthetized and fully investigated. The electrochemical process shows remarkable irreversible oxidation in the first cycle. The material operates in Li half-cell at 3.8 V with specific capacity of 130 mAh g −1 . The irreversible capacity is advantageously exploited to balance a Li-ion full cell. The new Li-ion cell combines LiNi0.2 Co0.2 Al0.1 Mn0.45 O2 with a silicon oxide composite. Abstract: A layered LiNi0.2 Co0.2 Al0.1 Mn0.45 O2 cathode is herein synthetized and investigated. Scanning electron microscopy (SEM) shows the layered morphology of the composite powder, while energy dispersive X-ray spectroscopy (EDS) and Inductively Coupled Plasma-Mass Spectrometry (ICP-MS) confirm the achieved stoichiometry. X-ray diffraction (XRD) well identifies the layered structure unit cell, and Raman spectroscopy displays the corresponding M-O bonds motions. The cycling voltammetry (CV) of LiNi0.2 Co0.2 Al0.1 Mn0.45 O2 in lithium half-cell reveals an electrochemical process characterized by a remarkable irreversible oxidation taking place at 4.6 V vs. Li + /Li during the first scan, and subsequent reversible Li (de)intercalation centered at 3.8 V vs. Li + /Li with interphase resistance limited to 16 Ω upon activation as indicated by electrochemical impedance spectroscopy (EIS). The relevant irreversibility during first charge is also detected by galvanostatic cycling in a lithium half-cell subsequently operating at an average voltage of 3.8 V with a stable trend, and a maximum specific capacity of 130 mAh g −1 . The initial irreversible capacity of the layered cathode is advantageously exploited for compensating the pristine inefficiency of the Li-alloying composite anode in a proof-of-concept Li-ion battery achieved by combining the LiNi0.2 Co0.2 Al0.1 Mn0.45 O2 with a silicon oxide composite (SiO x -C) without any preliminary pre-treatment of the electrodes. The full-cell displays a cycling behavior strongly influenced by the anode/cathode ratio, and the corresponding EIS performed both on the single electrodes and on the Li-ion cell by using an additional lithium reference suggests a controlling role of the anode interphase and possible enhancements through a slight excess of cathode material. Graphical abstract: A layered LiNi0.2 Co0.2 Al0.1 Mn0.45 O2 cathode is synthetized, fully investigated and combined with a SiOx -C alloying anode in an new Li-ion battery without any pre-activation processes. Image, graphical abstract